Heliboard can have swipe typing. It relies on a closed source library though, so…

https://github.com/Helium314/HeliBoard?tab=readme-ov-file#features

• Glide typing (only with closed source library ☹️)
• library not included in the app, as there is no compatible open source library available
• can be extracted from GApps packages (“swypelibs”), or downloaded here (click on the file and then “raw” or the tiny download button)

A good minimalist text based launcher that’s open source is Olauncher. Maybe not what you’re after (comparing it to Smart Launcher) but thought I’d suggest it just in case.